The present investigation was designed to evaluate the acute effect of aerobic exercise on oxidative stress and the flow properties of the blood. Fourteen clinically healthy subjects (7 men and 7 women aged 56+/-19 yr) underwent maximal treadmill exercise with blood samples drawn prior to and immediately after exercise. Post-exercise significant increases… (More)

Distances between the metal ions bound to the product terminus i site and the substrate i + 1 site of Escherichia coli RNA polymerase range from 5.0 to 5.6 A when the substrate is complementary to a template base and from 6.5 to 7.0 A for a noncomplementary relationship. The metal bound to the substrate at the i + 1 site exhibits a constant distance to the… (More)

The two substrates between which an internucleotide bond is formed in RNA synthesis occupy two subsites, i and i + 1, on the active site of Escherichia coli RNA polymerase, and each subsite is associated with a metal ion. These ions are therefore useful as probes of substrate interaction during RNA synthesis. We have studied interactions between the metals… (More)

Since a major function of RNA polymerase must be to bring together substrates in the optimal configuration for internucleotide bond formation, studies have been undertaken to understand the geometrical relationship of the two substrates. A model has been constructed for the geometry of interaction of two ATP molecules poised on the active site of the… (More)